Switching from one tab to another VBA

Hi, I'm supposed to modify one tiny chunk of codes from a long VBA Excel Macro. That tiny chunk is currently looking up one worksheet. I need it to look up another worksheet first if it exists, otherwise look at the current worksheet. Could someone suggest how to modify it? Thanks!

Code:

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workbooks (wkbk_accoun1).sheet("account1").select

amount1= worksheetfunction.match("colA", rows ("5:5"),0)

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Code:

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Dim Account1Exists as boolean
Dim Sht as Worksheet

Account1Exists = False
For each Sht in Worksheets
  If Sht.Name = "account1" Then Account1Exists = True
Next

If account1Exists then
  Sheets("Account1").Select
Else
  Sheets("Account2").Select
End if

amount1= worksheetfunction.match("colA", rows ("5:5"),0)

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